G - Physics – 06 – F
Patent
G - Physics
06
F
354/215
G06F 3/02 (2006.01) G06F 7/38 (2006.01) G06F 15/02 (2006.01)
Patent
CA 1046644
ABSTRACT An adaptable programmable calculator is provided by employing a modular read-write and read-only memory unit, a central processing unit, and an input-output control unit capable of bidirectionally transferring information between the memory or central processing units and a number of input and output units. These input and output units include an alphanumeric keyboard input unit, a magnetic tape cassette reading and recording unit, an alphanumeric solid state output display unit, an output printer, an X-Y plotter, a magnetic or paper tape reading and recording unit, a magnetic disc reading and recording unit, and a modem for connecting the calculator via telephone lines to a remotely located computer. The calculator employs an extended version of BASIC computer language and allows the user to enter a line comprising one or more alphanumeric statements into the calculator from the key- board input unit while visually observing an alphanumeric display of the line to check for errors therein. Syntax errors are automatically detected by the calculator when an entered statement is terminated, and execution errors are automatically detected upon attempted execution of a statement or statements. Both types of errors are indicated to the user via error messages displayer by the output display unit. The calculator employs a compiler for converting each statement entered into the calculator in BASIC language into an internal stored format. It also employs an uncompiler for regenerating in BASIC language any entered line converted to the internal stored format. The magnetic tape cassette reading and recording unit employed in the calculator allows the user to chain together several pro- gram segments and allows program manipulation of several blocks of data on an individual basis. An interrupt feature of the cassette unit facilitates searching for a particular file located on a magnetic tape at the same time the calculator is performing other functions.
174483
Burmeister Eugene V.
Cada Frank E.
Christopher Chris J.
Covington Wayne F.
Judd Myles A.
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